What is a rhumb line?

A rhumb line, also known as a loxodrome, is defined as a line that crosses all meridians at the same acute angle. This characteristic allows it to maintain a constant compass direction, making it particularly useful for navigation. By following a rhumb line, a navigator can plot a course that remains consistent in terms of heading, simplifying the process of maintaining direction over long distances.

This makes option C correct, as it highlights the defining feature of a rhumb line—the fact that it intersects all meridians at right angles. This property differentiates it from other types of navigational paths, which may not maintain a constant angle relative to the meridians.

In contrast, other options have distinct definitions that do not apply to a rhumb line. For instance, a straight line connecting two points on the earth's surface could be misconstrued as a rhumb line, but in practical terms, that description more closely aligns with a great circle path, typically the shortest distance between two points on a sphere. A line running along a parallel of latitude would also not qualify as a rhumb line, since it only moves east or west and does not cut meridians at an angle. Furthermore, the concept of a